US8714315B2 - Parking brakes - Google Patents

Parking brakes Download PDF

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Publication number
US8714315B2
US8714315B2 US10/576,749 US57674904A US8714315B2 US 8714315 B2 US8714315 B2 US 8714315B2 US 57674904 A US57674904 A US 57674904A US 8714315 B2 US8714315 B2 US 8714315B2
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United States
Prior art keywords
parking
brake
lever
brake shoe
parking lever
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US10/576,749
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US20070068743A1 (en
Inventor
Luigi Tessitore
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Automotive Products Italia SV SRL
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Automotive Products Italia SV SRL
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Assigned to AUTOMOTIVE PRODUCTS ITALIA (SV) S.R.L. reassignment AUTOMOTIVE PRODUCTS ITALIA (SV) S.R.L. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: TESSITORE, LUIGI
Publication of US20070068743A1 publication Critical patent/US20070068743A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D66/00—Arrangements for monitoring working conditions, e.g. wear, temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D66/00—Arrangements for monitoring working conditions, e.g. wear, temperature
    • F16D66/02—Apparatus for indicating wear
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D65/00—Parts or details
    • F16D65/14—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position
    • F16D65/16—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake
    • F16D65/22—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake adapted for pressing members apart, e.g. for drum brakes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D51/00—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like
    • F16D2051/001—Parts or details of drum brakes
    • F16D2051/003—Brake supports
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2121/00—Type of actuator operation force
    • F16D2121/14—Mechanical
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2125/00—Components of actuators
    • F16D2125/18—Mechanical mechanisms
    • F16D2125/58—Mechanical mechanisms transmitting linear movement
    • F16D2125/60—Cables or chains, e.g. Bowden cables
    • F16D2125/62—Fixing arrangements therefor, e.g. cable end attachments

Definitions

  • This invention relates to parking brakes and in particular to parking brakes hereinafter referred to as of the type described which comprise a backplate, first and second brake shoe portions mounted on the backplate, a drum encircling the brake shoe portions, a parking lever pivoted adjacent one end on one of the brake shoe portions, and a strut extending between a first abutment on the parking lever and a second abutment on the other of the brake shoe portions so that operation of a handbrake cable pivots the parking lever relative to said one brake shoe portion so that the parking lever moves from a retracted position to an operative position thus moving the strut which in turn moves the other brake shoe portion away from said one brake shoe portion to bring the shoe portions into contact with the drum thus apply the parking brake.
  • the brake shoe portions may be provided by separate brake shoes as in a normal twin shoe brake or by opposite end portions of a single generally U-shaped shoe of the form disclosed in, for example, EP392829 or WO99/53212, incorporated by reference herein.
  • Parking brakes of the type described may also form part of a drum brake which provides a parking brake function only or also provides a service brake function or may form part of a drum-in-disc brake in which a radially inner parking brake drum is surrounded by a brake disc on which a disc brake caliper acts to provide the service brake function.
  • Parking brakes of the type described are well known and generally work efficiently.
  • problems can arise in correctly adjusting the length of the connecting cable/cable tensioning when the vehicle is being assembled on the production line. This can result in vehicles leaving the production line with an excessive amount of travel of the handbrake lever before the parking brake is correctly applied.
  • spring means act between the parking lever and said one brake shoe portion to tend to retract the parking lever to its retracted position.
  • the parking brake of the present invention thus ensures that the connecting cable is correctly tensioned and no slack exists in the cable when the brake is released. Also the provision of the spring means between the parking lever and said one brake shoe portion helps to ensure that when the parking brake is released the brake shoe portions are correctly retracted and do not drag on the drum.
  • the viewing opening is preferably located so that when the parking lever is released the position of an end nipple on the cable is visible allowing confirmation that the nipple is correctly connected with the parking lever.
  • the viewing opening preferably has a removable cover to allow closing of the opening when the brake is in use.
  • the datum surfaces are provided by an abutment on the parking lever designed to contact an edge of said one brake shoe portion when the parking lever is in its fully retracted position and the parking lever includes an aperture through which the position of said abutment relative to said edge is visible through the viewing opening.
  • the aperture preferably allows the insertion of a measuring device (e.g. a feeler gauge) between the abutment and edge to check more accurately the position of the parking lever relative to said brake shoe portion.
  • a measuring device e.g. a feeler gauge
  • the abutment is designed to be spaced a given distance (e.g. 1 mm) from the edge of the brake shoe portion when the handbrake lever is in a predetermined released position thus ensuring that the cable is correctly tensioned and no slack exists in the cable.
  • the abutment on the parking lever may conveniently comprise a tang bent out of the parking lever.
  • the spring means is a coil spring with end hooks which hook around the parking lever and said one brake shoe portion respectively.
  • the present invention also provides a method of testing that the operating cable of parking brake in accordance with the present invention is adjusted within specified limits comprising:
  • a feeler gauge or other measuring device is inserted between the datum surfaces via the viewing opening to establish the position of the parking lever.
  • FIG. 1 is a front view of a drum brake which includes a parking brake in accordance with the present invention
  • FIG. 2 shows a perspective view on a larger scale of the shoe mounted parking lever arrangement of the brake of FIG. 1 ;
  • FIG. 3 shows diagrammatically the lever arrangement of FIG. 2 ;
  • FIG. 4 shows a rear view of the brake of FIG. 1 with the cover over the viewing opening removed
  • FIG. 5 shows an alternative form of parking lever return spring.
  • FIG. 1 this shows a drum brake in which two brake shoes 11 and 12 are mounted on a backplate 13 for operation by a hydraulic wheel cylinder 14 to engage an encircling drum (not shown) to provide a service brake function in the known manner.
  • a parking brake function is also provided in which clockwise pivoting (as viewed in FIG. 1 ) of a parking lever 15 about a pin 21 carried by shoe 12 applies both shoes to the brake drum via a strut 16 which extends between the shoes.
  • a pull-off spring 16 a acts between the shoes 11 and 12 and the effective length of strut 16 is adjusted by the parking brake adjusting mechanism which is generally indicated at 17 and is built into strut 16 .
  • An example of a suitable adjuster mechanism is fully described in the Applicant's European patent number 0388057.
  • a retraction spring 16 b acts between the parking lever 15 and the web 12 a of shoe 12 .
  • the spring has end hooks 16 c and 16 d which engage a notch 15 a or other suitable abutment on lever 15 and an aperture 12 b in web 12 a of shoe 12 and tend to bias the lever 15 to its retracted position in which a tang 22 bent out of lever 15 contacts with edge 12 c of web 12 a.
  • the lower end of parking brake lever 15 is of U-shaped cross section forming a channel 18 (see FIG. 2 ) for the reception of the end of a handbrake operating cable 19 which has an end fitting in the form of a nipple 20 .
  • the cable may be operated by a manual driver-operated handbrake lever or by an electrical actuator as disclosed in, for example, FIG. 8 of the Applicant's co-pending Application No, PCT/GB03/003912.
  • the nipple 20 is manually engaged with the edge 18 a of channel 18 and prevented from disengagement with channel 18 by projection 18 b which engages behind the head of nipple 20 (see FIG. 2 ).
  • the present invention is useable with so-called quick-attach arrangements for connecting nipple 20 with channel 18 .
  • the Applicant's UK Patent No. 2328257 or PCT Application No. PCT/GB03/003310 disclose suitable forms of quick-attach arrangements.
  • the backplate 13 is provided with a viewing opening 40 (see FIG. 4 ) which is closed by a plastics snap-fit cover 41 when the brake is in use. Opening 40 is located so that, with cover 41 removed and the parking brake released, an operator can check the position of tang 22 with respect to the edge 12 c of shoe web 12 a via an aperture 23 formed in lever 15 through which edge 12 c of shoe web 12 a is visible and accessible.
  • the cable is actuated several times to bed-in the mechanism and the length of the cable is then adjusted (e.g. using a conventional nut adjustment at the drivers handbrake lever end of the cable or any other suitable adjuster located anywhere in the mechanism) so that when the handbrake lever is in a predetermined released position the tension in the cable is such that a predetermined spacing ‘x’ (see FIGS. 2 and 3 ) exists between the edge 22 a of the tang 22 and the edge 12 c of shoe web 12 a .
  • This spacing (which is typically of the order of 1 mm) can be checked using a feeler gauge or other measuring device inserted via opening 40 and ensures that there is no slack in the parking brake mechanism.
  • This spacing ‘x’ is chosen to correspond with a predetermined shoe clearance at the drum to ensure that the shoes do not drag on the drum.
  • retraction spring 16 b The release of the brake is also assisted by the use of retraction spring 16 b .
  • This spring arrangement which does not act on strut 16 is particularly useful when used with a strut 16 which includes a brake adjusting mechanism 17 of the type described in the previously referred to Applicant's European Patent No. 0388057 which relies on the relative axial movement of various parts of strut 16 which would be adversely affected if spring 16 b was axially loading parts of strut 16 .
  • the viewing opening 40 gives visual confirmation that the cable end fitting 20 is correctly latched to the lever 15 .
  • FIG. 5 shows an alternative parking brake lever return spring arrangement in which a loop-type spring 50 has an end 51 which acts against an abutment 52 on lever 15 and a second end 53 which extends through a hole 54 in the shoe web 12 a to bias tang 22 towards shoe web edge 12 c.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Braking Arrangements (AREA)
US10/576,749 2003-10-22 2004-10-18 Parking brakes Active 2026-03-06 US8714315B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GBGB0324571.9A GB0324571D0 (en) 2003-10-22 2003-10-22 Parking brakes
GB0324571.9 2003-10-22
PCT/IB2004/003423 WO2005040632A1 (en) 2003-10-22 2004-10-18 Parking brakes

Publications (2)

Publication Number Publication Date
US20070068743A1 US20070068743A1 (en) 2007-03-29
US8714315B2 true US8714315B2 (en) 2014-05-06

Family

ID=29595550

Family Applications (1)

Application Number Title Priority Date Filing Date
US10/576,749 Active 2026-03-06 US8714315B2 (en) 2003-10-22 2004-10-18 Parking brakes

Country Status (7)

Country Link
US (1) US8714315B2 (de)
EP (1) EP1676046B1 (de)
JP (1) JP4724123B2 (de)
CN (1) CN100385136C (de)
DE (1) DE602004024702D1 (de)
GB (2) GB0324571D0 (de)
WO (1) WO2005040632A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10001159B2 (en) 2016-07-22 2018-06-19 Goodrich Corporation Park brake system adjustment tool

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7261190B1 (en) * 2005-08-23 2007-08-28 Robert Bosch Gmbh Reaction lever for a parking brake
DE102007037671A1 (de) * 2007-08-09 2009-02-12 Lucas Automotive Gmbh Halteblech für den Handbremshebel einer Trommelbremse bei der Erstmontage zur Erzeugung einer dauerhaften Vorspannung des Bowdenzuges
FR2923278B1 (fr) * 2007-11-06 2010-03-12 Bosch Gmbh Robert Segment pour frein a tambour.
KR101534986B1 (ko) * 2013-12-27 2015-07-24 현대자동차주식회사 주차 브레이크 작동용 케이블의 장력 유지용 레버 및 이를 이용한 주차 브레이크 시스템
JP6198889B1 (ja) * 2016-05-24 2017-09-20 豊生ブレーキ工業株式会社 車両用ドラムブレーキ
JP6638617B2 (ja) * 2016-10-14 2020-01-29 住友電装株式会社 電線保持具およびワイヤハーネス
FR3072436B1 (fr) * 2017-10-17 2021-05-28 Foundation Brakes France Segment de frein a tambour comportant une ame portant un levier de frein de stationnement et un moyen de rappel dedie pour plaquer le levier contre l'ame
CN108591313B (zh) * 2018-06-20 2024-04-23 长兴罗拉机电有限公司 一种鼓刹机构

Citations (3)

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Publication number Priority date Publication date Assignee Title
FR2599797A1 (fr) * 1986-06-06 1987-12-11 Fiat Auto Spa Dispositif mecanique de commande d'un frein a tambour pour vehicules
US6502670B1 (en) * 1998-08-07 2003-01-07 Nisshinbo Industries Inc. Mechanical type drum brake device
US6802397B1 (en) * 1997-03-13 2004-10-12 Automotive Products Italia (Sv) Spa Automatic cable latching device for drum brake levers

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DE2637205A1 (de) * 1976-08-18 1978-02-23 Josef Fuchs Fahrzeugbremse, insbesondere trommelbremse fuer kraftfahrzeuge
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JP3263836B2 (ja) * 1994-04-26 2002-03-11 日清紡績株式会社 ドラムブレーキ装置
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AUPP291498A0 (en) * 1998-04-09 1998-05-07 Pbr Automotive Pty Ltd Brake shoe and brake assembly

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2599797A1 (fr) * 1986-06-06 1987-12-11 Fiat Auto Spa Dispositif mecanique de commande d'un frein a tambour pour vehicules
US6802397B1 (en) * 1997-03-13 2004-10-12 Automotive Products Italia (Sv) Spa Automatic cable latching device for drum brake levers
US6502670B1 (en) * 1998-08-07 2003-01-07 Nisshinbo Industries Inc. Mechanical type drum brake device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10001159B2 (en) 2016-07-22 2018-06-19 Goodrich Corporation Park brake system adjustment tool

Also Published As

Publication number Publication date
CN100385136C (zh) 2008-04-30
EP1676046B1 (de) 2009-12-16
GB2421772A (en) 2006-07-05
JP2007509297A (ja) 2007-04-12
WO2005040632A1 (en) 2005-05-06
GB2421772B (en) 2007-03-14
GB0606494D0 (en) 2006-05-10
DE602004024702D1 (de) 2010-01-28
EP1676046A1 (de) 2006-07-05
GB0324571D0 (en) 2003-11-26
CN1871448A (zh) 2006-11-29
US20070068743A1 (en) 2007-03-29
JP4724123B2 (ja) 2011-07-13

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